OIDC Logout filter

[czhou-brex]

Is your feature request related to a problem? Please describe.
We are using the OIDC filter but it is missing the logout filter, such as grantLogout for the oauthgrant filter. Thus we are not able to unset cookies created by skipper easily.

Describe the solution you would like

• a constant cookie name to know which cookie to unset
• logout filter for oidc, similar to grantLogout

Describe alternatives you've considered (optional)
Tried oauthgrant with grantLogout but was not able to make it work with our ingress routing scenario

Additional context (optional)
Add any other context or screenshots about the feature request here.

Would you like to work on it?
Yes